Storm的Bolt类中有个prepare函数，他的功能是什么（)。

A.DeserializeQueue

B.SerializeQueue

C.ExecutorQueue

D.OutputQueue

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A.They have unrealistic expectations about the other half．

B.They may not be prepared for a lifelong relationship．

C.They form. a more realistic picture of life．

D.They try to adapt to their changing roles．

A．Michael and Tom have ordered all the food.

B．Michael and Tom have made ail the preparations.

C．Other friends will bring all the stuff they need.

D．Michael's mother has prepared all the food.

A、Because the car had remained idle for too long.

B、Because the young couple were not good at driving.

C、Because a wrong bolt was used.

D、Because a second-hand car goes wrong easily.

A.连接运算

B.连接数据库

C.过滤(filter)

D.业务处理

A.7,8

B.8,7

C.7,7

D.8,8

A.2

B.18

C.4

D.6

若系统中有五个并发进程涉及某个相同的变量A,则变量A的相关临界区是由()临界区构成.

A.2个

B.3个

C.4个

D.5个

设S={1，2，3，4}，R为S上的关系，其关系矩阵是

则(1)R的关系表达式是。

(2)domR=，ranR=。

(3)R°R中有个有序对。

(4)R^-1的关系图中有个环。